Explanipedia

Effect of Acoustic Absorption by Hydrophone and Cable on A Reverberation Technique for Measuring Sound Absorption Coefficient of Particulate Suspensions Open

T.G. Leighton, Niven R. Brown, Simon D. Richards · 2002

Measurement of viscous sound absorption at 50–150 kHz in a model turbid environment Open

Niven R. Brown, T.G. Leighton, Simon D. Richards, A.D. Heathershaw · 1998

The visco-thermal absorption of sound by suspended particulate matter can be reliably measured using a reverberation technique. This absorption may have an adverse effect on the performance of sonars operating at 50–300 kHz in coastal wate…

Determination of the viscous and thermal characteristic lengths of plastic foams by ultrasonic measurements in helium and air Open

Ph. Leclaire, Luc Kelders, Walter Lauriks, Manuel Melon, Niven R. Brown , et al. · 1996

The acoustic wave most commonly transmitted and detected in the high-porosity absorbent materials used in noise control is generally the air-borne slow compressional wave. In a new experiment, the air saturating the sample is replaced by h…

Evaluation of the viscous characteristic length of air-saturated porous materials from the ultrasonic dispersion curve Open

Niven R. Brown, Manuel Melon, Valérie Montembault, Bernard Castagnède, Walter Lauriks , et al. · 1996

Ultrasonic measurements in air or water saturated porous media Open

Bernard Castagnède, Manuel Melon, Niven R. Brown, J. F. Allard · 1994

Low-frequency (20 kHz–180 kHz) ultrasonic measurements have been performed in numerous air-saturated acoustic materials, i.e., various foams and felts. By using a standard pulse-echo technique, very precise wave-speed measurements were ach…

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